Fix scheduler inProgressJobRetention parsing

[hunhoffe]

Description

In the recent commit, inProgressJobRetention is parsed as an integer. However, in places such as ansible/group_vars/all and src/test/resources/application.conf.j2 it was defined as a Duration (e.g., default is '20 seconds')

This PR is to change inProgressJobRetention to be parsed as a duration.

Related issue and scope

• I opened an issue to propose and discuss this change (#????)

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Scheduler
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[style95]

Thank you for handling this.